1/*
2 * Copyright (C) 2008 Apple Inc.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "CSSCanvasValue.h"
28
29#include "ImageBuffer.h"
30#include "RenderObject.h"
31#include <wtf/text/StringBuilder.h>
32
33namespace WebCore {
34
35CSSCanvasValue::~CSSCanvasValue()
36{
37    if (m_element)
38        m_element->removeObserver(&m_canvasObserver);
39}
40
41String CSSCanvasValue::customCssText() const
42{
43    StringBuilder result;
44    result.appendLiteral("-webkit-canvas(");
45    result.append(m_name);
46    result.append(')');
47    return result.toString();
48}
49
50void CSSCanvasValue::canvasChanged(HTMLCanvasElement*, const FloatRect& changedRect)
51{
52    IntRect imageChangeRect = enclosingIntRect(changedRect);
53    HashCountedSet<RenderObject*>::const_iterator end = clients().end();
54    for (HashCountedSet<RenderObject*>::const_iterator curr = clients().begin(); curr != end; ++curr)
55        const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this), &imageChangeRect);
56}
57
58void CSSCanvasValue::canvasResized(HTMLCanvasElement*)
59{
60    HashCountedSet<RenderObject*>::const_iterator end = clients().end();
61    for (HashCountedSet<RenderObject*>::const_iterator curr = clients().begin(); curr != end; ++curr)
62        const_cast<RenderObject*>(curr->key)->imageChanged(static_cast<WrappedImagePtr>(this));
63}
64
65void CSSCanvasValue::canvasDestroyed(HTMLCanvasElement* element)
66{
67    ASSERT_UNUSED(element, element == m_element);
68    m_element = 0;
69}
70
71IntSize CSSCanvasValue::fixedSize(const RenderObject* renderer)
72{
73    if (HTMLCanvasElement* elt = element(renderer->document()))
74        return IntSize(elt->width(), elt->height());
75    return IntSize();
76}
77
78HTMLCanvasElement* CSSCanvasValue::element(Document* document)
79{
80     if (!m_element) {
81        m_element = document->getCSSCanvasElement(m_name);
82        if (!m_element)
83            return 0;
84        m_element->addObserver(&m_canvasObserver);
85    }
86    return m_element;
87}
88
89PassRefPtr<Image> CSSCanvasValue::image(RenderObject* renderer, const IntSize& /*size*/)
90{
91    ASSERT(clients().contains(renderer));
92    HTMLCanvasElement* elt = element(renderer->document());
93    if (!elt || !elt->buffer())
94        return 0;
95    return elt->copiedImage();
96}
97
98bool CSSCanvasValue::equals(const CSSCanvasValue& other) const
99{
100    return m_name == other.m_name;
101}
102
103} // namespace WebCore
104